CVE-2026-50266 | THREATINT

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Description

In OpenStack Neutron before 28.0.1, a project manager can create or update a port on a shared network owned by another project and set device_owner to a value that has “network:” at the beginning (“network:dhcp” for example). The default port RBAC policies incorrectly included PROJECT_MANAGER without requiring network ownership, allowing any project manager to obtain trusted network-service port behavior on shared networks. Depending on backend and deployment, this can bypass anti-spoofing and security group protections, enabling DHCP, MAC, or IP spoofing against other tenants on the shared network. This is a regression of CVE-2015-5240 (OSSA-2015-018).

PUBLISHED Reserved 2026-06-04 | Published 2026-06-04 | Updated 2026-06-04 | Assigner mitre

LOW: 2.2CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N

Problem types

CWE-863 Incorrect Authorization

Product status

Default status
unaffected

25.0.0 (semver) before 25.2.4
affected

26.0.0 (semver) before 26.0.4
affected

27.0.0 (semver) before 27.0.3
affected

28.0.0 (semver) before 28.0.1
affected

References

launchpad.net/bugs/2152115 issue-tracking

review.opendev.org/990273 patch

review.opendev.org/990353 patch

review.opendev.org/990356 patch

www.openwall.com/lists/oss-security/2026/06/04/6

cve.org (CVE-2026-50266)

nvd.nist.gov (CVE-2026-50266)

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